Timer for toasters and the like



Oct. 21, 1952 A. J. HUCK EI'AL TIMER FOR TOASTERS OR THE LIKE 3 Sheets-Sheet 1 Filed Oct. 12, 1948 wk R 8 E. 5 m w I; 1&5;

26.5 75 a z w 9%? 5 5 N N h MN Oct. 21, 1952 A. J. HUCK EI'AL 4,

TIMER FOR TOASTEJRS OR THE LIKE Filed Oct. 12, 1948 3 Sheets-Sheet 3 12 Fig.7]. 7 62 I 10 61 r w.

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Patented Oct. 21, 1952 UNITED STATES, PATENT OFFICE TIMER FOR TOASTERS AND THE LIKE Alfred J. Huck and Charles D. Visos, St. Louis, Mo., assignors to Knapp-Monarch Company, St. Louis, Mo., a corporation'of Delaware Application October 12, 1948, Serial No. 54,142

invention relates to a thermal control for toasters and the like in which a temperature responsive elementis heated by energization of a heating element therefor and warpsto a heatup point whereupon the circuit i conditioned:

One objectof the invention .is to provide a thermal control in which a heater operates at a relatively high temperature andits' heat is mainly radiated to a bimetal element for rapid heating thereof, the heaterhaving a very minimum of thermal lag initially due to its very small mass which, combined with its heat radiation characteristics, causes unusually rapid response of 'the bimetal element in its heat-up and cooloff operations, the bimetal thereby reacting quicklyto accurately respond to both heat-up and cool-oil conditions of the heater itself and the bimetal element being arranged to'warp toward the heater upon increase of temperature whereby its deflection rate increases near the end of the heat-up part of the control cycle and has asubsequent high rate of loss of heat during the cool-off, part of the cycle to secure a maximum. of control accuracy andreliability of the bimetal action. 7 v

Another object is to provide one means for adjustingthe control for the desired color of toast on the first toast load or cycle and another means for adjusting for lighter or darker toast on successive toasting operations'subsequent to the first cycle, that is adjusted so that successively lighter loads of toast in one continuous run or successively darker loads can be corrected for at the factory and subsequently by the service, man without the necessity of opening thetoa'stervto gain access to the adjusting mechanism.

I 7 Claims; (01. '99 s29) knob thatcan be adjusted by the user of the toaster by rotation, the knob being arranged to secure a three-way action in which sliding movement of the knob in one direction manually releases the bread carrier of the toaster independent of the automatic control release, and sliding movement in the other direction prevents complete release of the bread carrier so thatit will stay in lowered position to keep the toast warm from the residual heat in the toaster, thus eliminating all but two controls on'the toaster,

one for depressing the bread carrier and the other being the three-way control knobjust referred to.

. sun a further object is lto provide a contact arrangement in which a permanent magnet holds the contacts in engagement with each other to deenergizethe heater for the thermallyrespon-M sive element and such holding occurs during'a cool-off cycle portion with automatic resetting at the end of each complete cycle so that no addir tional member is required to reposition the mag net-held contacts at either the end or the start of every successive control cycle.

More specifically it is our object to provide a v control in which an electric heater heats a bimetal element and it in turn is operable to establish circuits during a heat-up portion of the control cycle anddeenergizes the heater when a permanent magnet acts on certain of the contacts so that the bimetal element can then cool off and at the end of a cool-off portion of the cycle a switch shunting a thermal motor type of latch for the bread carrier is opened for the purpose of energizing the latch and causin it to release the bread carrier, the entire toasting cycle then being represented by the heat-up time plusthe cool-off time plus the latch operation, the magnet-engaged contacts being returned to their initial position by movement. of the bread carrier to its initial position at the end of the Still another object is to provide a control so ing a thermal motor that acts as a latch release so that the power afforded by the electric current actuating the thermal motor is utilizedto overcome any friction loads that might be present in sliding or pivoting parts.

- :A' further object is'to provide a color control I toasting cycle.

An additional object is to provide a normal color control in the form of a readily adjustable knob, factory or service adjustments being additionally operable to set'the heat-up and cooloil points, these last two adjustments being relatively less accessible than the control knob and inconspicuous by bein hidden within the housing of the toaster but nevertheless accessible by the insertionof a small tool through perforations in the housing. l

, With these and other objects in view, our. in-, vention consists in the construction, arrangement and combination of the various parts of our device whereby the objects contemplated are attained, as hereinafter more fully set forth,

an end elevation of -our control mechanism together with some of the master mechanism.

Figure 2 is a front elevation of our control mechanism in the toaster looking toward the left in Figure 1 and with the housing of the' toaster shown in section on the line 22 of Fi ure 1.

Figure 3 is a detail sectional view on the line.

3-3 of Figure 1 showing-a bread carrier latch lever and a latch release element therefor.

Figure 4 is a sectional view on the line 4-4 of Figure 2 and illustrates our control mechanism in plan view.

Figure 5 is a fragmentary View of a portion of thetoaster'housing and shows a control knob lookingtoward theleft at Figure 1.

Figure 6 is a sectional View onthe line 6- 6 of Figure 2. j Y

Figure '7 is an elevation of our control mechani'srn looking from the back or in a direction opposite that for Figure 2 and showing parts of the toaster in section on the line 1? of Figurel.

"Figure 8 is an elevation of our control mechanismlooking toward the left in Figure 2.

Figure 9 is an elevation of parts of the control looking from the back as in Figure? and taken onthe line s- 9 of Figure 1. I a

' Figure "'10 'isja diagrammatic View of the control mechanism showing the parts thereof in normal position at room temperature and when the bread carrier has just been, depressed.

Figure llshows the thermally responsive element moved by heat of the thermal heater to a position where it engages intermediate contacts with each other and causes them to advance toward a position where heater shunting contacts are held closed by a permanent magnet.

Figure 12 shows the contacts in position where they are held by the permanent magnet and the thermal'heaterelement is deenergized so that the thermal element itself starts back on its cooloff cycle.

Figure 13 is a horizontal detail sectional view ori'the line l3l3 of Figure 9 and Figure l4 isa vertical sectional View on the line Iii-43 of Figure 14.

On the accompanying drawings I have used the reference numeral ID to indicate a toaster tically slidable in a slot 22 of the end plate Hi.

The housing i4 is also provided with a slot indicated at 23 through which the bracket ZBextends. A handle 24 is mounted on the bracket exterior of the slot 23 for depressing the bread carrier, against the action of a spring l9 which normally raises the bread carrier. The bracket 2!} is provided with a lug 15 (see Figure 3) with which a locking lug !3 of a bread carrier latch lever 25 is adapted to coact for the purpose of holding the bread carrier in the lowered or toasting position. The latch lever 25 is pivoted 4 at 25a to an ear 2? extending upwardly from a switch base plate 26.

The latch lever 25 in turn is adapted to be latched in position by a latch blade 28 which is spring biased to the latching position by being mounted on a leaf spring 28a secured to an ear 29 extending upwardly from thebase plate 26, a

bifurcatedbracket 30 alsojextending upwardly from the switch base plate serving as a guide for the latch lever 25.

The lug 55 engages the top of the latch lever I 25 to the right of the lug I? in Figure 3 for the purpose or swinging the latch lever downwardly when the bread carrier is lowered, thus causing an inclinedcam surface 3| on the right hand end of the lever to engage the latch blade 28 and move it toward the right untilit snaps over the upper end of the cam 3| to the position shown. This latching action is accomplished in opposition to a spring which tends to rotate the latch lever 2 5co'unterclockwise about the pivot 25a.

For releasing the latch blade 28 I provide a latch release element 33 in the form of a U- shaped bimetalelement as shown in Figures 6 and 12 anchored by means of mounting screws 34 on brackets fib and 36. When electric current ilows through the element 33 from one screw 34 to the'other'it causes the element to warp toward the right in Figures 3 and 4 for engaging an adjusting screw 31 carried by the latch blade 28 to effect its release from the latch lever 25. The mechanism for energizing the latch release 33 will now be described. I

The screw 3? is insulated from the element 33 means'of a ceramic tip 3711, A thermal element heater is provided consisting of a resistance ribbon 38 or Nichrome or the like supported on terminal screws 3856 and 381). These screws are supported in'and insulated from a channelshaped housing lfi, a portion of which is broken away in Figure 9 to show 'the'heater' 38. The housing 433 isgsupported by a leg 39 depending therefrom and a post 4|. i

Above the housing 49 is a thermallyresponsive element 42 in the form of a strip of bimetal anchored at one end to the bracket, 35. The opposite end of the bimetal 42 is provided with a lateral extension 43 carrying a contact 44. Con-' tact springs 45 and 46 provided'with suitable contacts are normally engaged with each other and spaced from thecontact 44 as in Figure 10. The contact springs 45 and 46 are supported between'the brackets and 36. The spring has an armature 41 and the spring 46 has an extension provided with an insulating button 48 which is normally engaged against a flange 49 of a cool-down or follow-up adjusting screw 56.

The free end of the bimetal element 42 deflects downwardly upon an increase ofheat, such heat being radiated from the heater 38. The deflection'is from a cool start position shown at CS in Figure 10 and the bimetal passes through a cool-off point position COP with its termination of movement at a heat-up point position HUP. At the cool-oiT point the contactM engages the contact spring 46. Adjacent the heat-up point the bimetal element 42 brings the armature 47 into close enough proximity to a permanent magnet 5! so that the magnet causes the contact of the spring 45 to leave the contact of the spring 4%; and engage the magnet itself which acts as a third contact. The various contacts enumerated are in electrical circuits which will be described ater.

Y The magnet 5| ismounted on a 'bracket 5|; pivoted against a head of a color adjusting-screw 51 and held against a spool-like cam or eccentric 59 by a spring 5|] on the screw- 51'which attempts to swing the bracket 55 clockwise in Figure 9.-

The plate ;|2 is provided with a perforation 62 through which access may be hadj to the screw 51 by means of a smallscrew' driver. The cover I2 is also provided with a perforation 63 for gain-,

ing access to-the adjusting screw 50. The perforations-B2 and 63 eliminates the "necessity of-r'emoving" the base plate |-2 to gain access 'tothe screws50 and 51 yet access is not readily obvious to the user of the appliance, whereas both the markings LGT,'MED and-DRK shown in Fi ure 5 are provided on the base II] for cooperation with the knob 68 as Will hereinafter appear.

Referring to Figures 13 and 14 a pair of spring fingers 59 have detent portions 55 which coact withaflange 58 on the shaft'BT to normally hold it in the normal position of Figure 13, Or posi-' tivelyin a position pulled outwardly past the detents 55 (to the right in this figure). I .If the shaft is pushed inwardly (to the left in Figure 13) the flange spreads converging fingers 54 of the springs 69 and thereupon the fingers tend to return the flange to the normal position shown. An actuating plate is pivoted on a rivet H to the base plate 26 and'has a pair of upstanding flanges 53 on opposite sides of the flange 58. It'also has a latch releasing extension 13-and a bread carrier hook 12 adapted to coact" with anextension 12a on the bracket 20 as shown in Figure 3.

The toaster has one or more of the-heating elements HE which are controlledas to energization by a main switch consisting of contact springs 14 and 15 which are normallydisengaged' nor pulled so that it is in the i'ull line position of Figure-l3. The handle 24 on the bracket '20 is now pushed downwardly after the carriers 18 are loaded with slices of bread and as the bracket approaches the lower limit of its'movement the lug |5-thereon will engage the-inclined edge 25a of: the latch lever 25 (which lever is inclined upwardly as in Figure 7 before such engagement) and will swing it down to the position of Figure 3, thus latching its cam end 3| under the latchblade 28. During the swinging of the latch lever the lug |3 thereon swings to a position over the-lug |5 so that the bread carrier is thereby retained in the lowered position during toasting when'the handle 24 is released. The bread'car- .-rier'- will rise slightly but will be held againstfurther rise by the lug l3 engaging the lug |5.

The bracket 2|] has an extension-90 shown-in Figure '2 -which carries a ceramic insert 92. This insert engages the upper main switch blade-f(14) causing it to be lowered to engagement with the? lower main switch blade 15 as in-Figure 10*for establishing a circuit from a supply wire 94* I through the elements 14, 15, 46', 45, '38, 'SI and HE'to a second supply wire 96. Thus "the heating elements HE of the toaster and the'thermalv heater 38 are in an'established circuit and'are' the only elements of the control switch therein asthe latch .bimetal 33 is shunted out ofthe circuit by the contacts on the switch blades'45 and 46. The heating elements of the toaster'of cours radiate heat to the bread slices for toasting them and'the thermal heater 38 radiates heat tothe control bimetal 42 to cause it to warp from the cold start position CS in Figure 10 toward a circuit. The bimetal 42 accordingly1warps'fardue to their resiliency, and the bracket 20 of the bread carrier is adapted to engage the spring 14 for closing the switch as in Figures 10, 11 andl2' 'when the bread carrier is depressed all the way. These contacts'then remain closed while the bread carrier remains lowered for toasting as in Figure 3.

The various elements of our control are con--; nected in electric circuits as shown diagrammati cally in Figures 10, 11 and 12;

Means is provided for separating the armature 41 from the magnet 5| when the bread carrier rises and comprises-a light spring 16 extending to an insulator 11- carried by a U-shap'ed by links 80 at opposite ends (one end only being; illustrated) to the bracket 20 and a corresponding bracket (not shown) at the opposite ends of the bread carriers l8. A light shield 82 covers the slot 23 so the glow of the heater 38 cannot be seen through the slot.

2 Practical operation controlled for medium colored toast, theknob B8 .is adjusted to the medium position MED shown in Figure 5 and the knob is neither pushed.

ther and finally reaches the heat-up pointHUP shown in Figure 12 at which time the blade 45 is in the dotted position and sufiiciently within the field of the permanent magnet 5| to result in the magnet attracting the armature 41 to the solid line position illustrated. r, Y

-- The armature 41 constitutes a contact and the magnet 5| constitutes another contact which contacts shunt the thermal heater 38 outof the circuit so that'it commences to cool oflQ The cooling action of course removes the source of heat that warped the bimetal element 42 down wardly and accordingly it commences to warp upwardly leaving the armature 41 in contact with the magnet 5|.

When the ceramic insert 48 engages the flange 49 0f the adjusting screw 50, further upward warping of the bimetal element will separate'the contact 44 from the contact of the spring 46. This particular position prior to such separation isillustrated in Figure 11, thearmature 41 being still against the magnet. 5| as illustrated by dotted lines. I The separation of the contact 44 from the switch-blade 46 results in energization' of the bimetal element 33 because 45 and 46 are sep-' arated from each other due to the fact that the armature 41 is still in contact with the magnet.5l. The blades 45 and 46 shunt the bimetal 33 but it can also be said that the contact 44 and the blade 46 shunt this bimetal element which latter condition is a result of the armature 41 remaining in the-dotted position of .Figure ll as the bimetal element 42 cools down. It is therefore obvious that separation of 44 fromv lii will result in energization of 33 and within a few seconds'unlatching of the blade 23 from the latch lever 25 to permit the spring 32 to swingthe lever tothe position of Figure 7. This swings the lug l3 oiT the lug i to permit the bread'carrier to 'rise,- and in rising the ceramic insert 92 disengages from the main switch blade 14 so that its contact is separated from the contact 7 1-5, thereby entirely cutting off the circuit to thetoaster and all parts of the control mechanism. 1 I Briefly reviewing the subsequence of the operations: depression of the bread carrier closes the main switch l4'|5 to energize the heating element HE and the thermal heater 38. Warpage of the element 42 finally results in the heater 38 being shunted out of the circuit whereupon the timer cools down and at a cool-ofi point a shunt circuit for the bimetal element 33 is opened to permit the latch to unlatch the bread carrier thereby permitting it to rise and the current to the heating element is turned ofi.

For securing-proper thermal control of a complete toasting cycle the heat-up point l-IUP is adjustablejbytwo methods either of which provides a variation of the length of the toasting cycle. Bylowering the magnet 5| and therefore the heat-up point relative to the bimetal element 42 the cycle is lengthened. The normal method of accomplishing this'when the toaster is in use is to lower the right end in Figure 9 by suitable rotation of the knob 68. This normal method is the one practiced by the user of the toaster. v

The second method of accomplishing a longer cycle is to raise the left end of the lever 56 by adjusting the screw 51 whereupon the lever pivots around the cam 59 and its right end is thereby lowered. This second method is useful for setting the length of the cycle'of the switch at the factory or at the service station without altering the setting of the knob 68.

For securing uniform toast color on successive cycles (or loads of toast) after the toaster has been heated during one toasting cycle the.

cool-off point COP is adjustable by means of adjusting the screw 50. When it is adjustedto raise the flange 45 and thereby the cool-ofl point, the successive toasting cycles will provide successively darker toast or by adjusting the flange 49 downwardly the result will be lighter toast. This screw 50 is accessible through the opening 63 so that this adjustment can be made at the factory or at the service station without dis assembling the toaster and after such adjustments are made then in order to have all slices darker. as desired the control knob 68 is turned in the appropriate direction by the user.

In the event, after the control is set, the user of the toaster wants to release the bread carrier and discontinue the automatic control operation he can do so by pushing inwardly on the knob 68 which causes the disc 58 to swing the plate as the plate is operatively connected with the disc by the fingers 53. This causes the extension 13 on the plate 10 to engage the latch plate 28 and move it toward the right in Figure 4 thereby unlatching it from the latched lever (position shown in Figure 3) thereby permitting the bread carrier to rise under the action of the spring l9. This is a manual release in-' dependent of the automatic release of the latch blade 28 by the bimetal element 33 which con v stitutes a thermal relay or thermal motor for automatically accomplishing the unlatching operation.

In some instances it is desirable to keep the toast warm by permitting the main switch to open but keeping the bread carriers in the lowered position so that the toast will be kept warm and will be further dried out by the residual heat in the toaster. This is accomplished by pulling out on the knob 68 so that the extension 72 ,then occupies a position overlying the projection [20. of the bracket 20 so that when the thermal latch 33 operates to release the latch lever 25 it will not swing all the way up under the action of the spring 32 but only a slight distance represented by the distance between 12a and 12 in Figure 3. While this is enough movement of the bread carrier to permit the main switch 14-45 to open it does not permit the bread to be raised to the normal visible position as when the knob is in the normal position of Figure 13.

This adjustment of the knob might be termed a keeps warm, adjustment and must be made each time desired after the breadcarrier is de-.

pressed. Then when the user of the appliance wishes to use the toast he presses in on the knob 68 to return it to the normal position of Figure 13 which releases 12 from 12a and permits the bread carrier to rise the rest of the way. The detents 55 serve to retain the disc 58 in the forward or keeps warm position until such time as the bread carrier is normally released by pressing the knob 68.

We have disclosed a toaster control switch having a number of advantages as outlined in the objects of our specification. While the control has been described specifically fora toaster it can be used in conjunction with other types of electrical appliances where it is possible to perform a control cycle by means of a thermally operated control device. The general plan of. a heat-up, cool-down type of control has been com-v bined with aco-ntact arrangement that shunts out the heater for the control .bimetal, and a latch is so shunted by a switch operated by the bimetal that efficient operation is had with accurate control in all cycles of the toaster. The elements of the control switch are so arranged and so provided with adjustments that even toasting in successive cycles can be adjusted into any toaster-control combination regardless of normal variations in manufacture or difference in materials. After these adjustments are made the control switch will then produce even coloring of the toast when the toaster is adjusted at the knob 68 for light, medium or dark toast.

Some changes may be made in the construction and arrangements of the parts of our toaster control without departing from the real spirit and purpose of our invention, and it is our intention to cover by our claims any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope. v

We claim as our invention:

1. In a thermal control for a toaster having a heating element and a bread carrier movable to a position for operating the toaster, a main switch closed by said last element for energizing said heating element, a latch for said bread carrier and said main switch, said thermal control comprising a thermal heater and a thermal latch releasing element incircuit with said heating element, a thermal element aiTected by the heat from said thermal heater, a series of four contacts, two connected between said thermalheater "and one side of said thermal: latch releasing; element, the third qne toothepother side .of said thermal latch releasing element; and the fourth one to the OlJhGl'gSidGiOf said: thermal heater,

saidthermal-elementbeing movableirom a cold,-

contacts and closes said second andfourth contacts, said thermal-element as itacools downafter said thermal heater is deenergized by closure of said second 1 and fourth: contacts, opening said first and third contacts at 'saidscool-ofi point, and adjusting means rotatable for adjusting for toast color-by changingthepcsition of the heat-.up

point, said adjusting 'means being adapted'to'be pulled outwardly 'for ho-lding said bread carrier against rising abo've aposition where itjust opens the main'switch thereby tO'keep: the toast'warm.

- 2. 'In a 1 thermal control for l a toas'ter havingx a "heating elementa'ndi.v bread carrier movable to position for operatin "switch closed by -said:.bread carrier for energizing said heating element, a -latch forsaid'bread car- -"rier and-said main switchysaid thermal control comprising a thermal latch-releasing element and the appliance, a main a thermal heater in "oli e with said heating element, a thermal elem affe'ctedby the heat from said thermal heater,- a pair of shunt switches for 1 saidthermal latch" releasing element, one normally closed and the other normally open, a normally -openfsh nt switch for said thermal heaterto deene'r'gizeit when closed, said thermal element being movable from a cold position through a position where it' closes said second shunt switch, to final position whereit opens said first shunt switch and closes'said third shunt ffor' 'adjusting for range ofoperation by changing fthje position of opening-of said first switch-by said thermal element, said knob' being adapted, to be pushed inwardly to release aid breadcarrier -;independent of said thermar la tbh releasing elem'ent, means-to return'saidknob to its normal position, said-knob being adapjted to be pulled outwardly for holding saidbread carrier against movement 'beyond'a position where it just; opens hBimain-switch.

3 In'a thermal control for a toasterhaving a heating element and" abread carrier movable to a position for operating the toaster, a main switch closed by said bread carrier for energizing said heating element, a latch for said bread carrier and said main switch, said thermal control comprising a thermal heater and a normally closed switch in circuit with said heating element, a thermal element affected by the heat from said thermal heater, athermal latch releasing element shunted by said switch and in circuit with said thermal heater when said switch is open, a second shunting switch for said thermal latch releasing element, a third switch to shunt said thermal heater, said thermal element being movable from a cold-start position through a cooloffpoint where it closes said second shunting switch to a heat-up point where it opens said first switch and closes said third one, said thermal element as it cools down after said heater is deenergized by closure of said second switch opening said second shunting switch at said cool-off point, and adjusting means rotatable for ad- 10 I justing for toast color by changing the position of the heat-up point, said adjusting means being adapted to be pushed inwardly to release the bread carrier independent of said thermal latch releasing element, and means to return said adjusting means to its normal position.

In a thermal control, a manually movable element, means to normallybias said. element to an initial position, said elementsetting the control in operation when said element is movedto a predetermined position from said initial position and against said bias, current responsive latch means for said element insaid predetermined position, a heater and a normally closed switch in series circuit with ,each other, a temperature responsive element affected by the heat from said heater, said current responsive latch means being shunted by said switch, a second shunting-switch for saidcurrent responsive latch means, a third switch to shunt said heater, said temperature responsive element being movable from a cold-start position to a, cool-cit point where it closes said second shunting switch, and

further movable to a heat-up point where it efiects opening of said first switch and closing of said third one, means to hold said first switch open and said third switch closed, said temperature responsive element as it cools down after saidheater is de-energized byclosure of said third switch,.0pening said second shunting switch at 'said co'ol-ofi pointwhereupon the current that was carried by said second shunting switch flows through said current responsive latch means to unlatch the same from said manually movable element, said manually movable'element being connecte'd'to said first switch to reclose the same as; said manually movable element is returned by-its bias to its initialposition.

5. In a; thermal control, an element movable to a position for operating the control, a latch therefor, a, main switch closed by saidelement when so moved and thereupon held closed by said latch, said thermal control comprising a normally closed switch and two normally open switches,;a heater and said normally closed switch beinginitiallyin circuit with said; main switch, 'a temperature responsive elementaffected by the: h'eatfrom said heater, a currentresponsive element for. releasing said latch, saidiwelementbe'ing shunted by said normally. closed switch, 'oneiof 'sa'idi normally open switches shunting-said heater' to de-energize it when thexswitch closes, magnetand armature means. :to. efi'ect: the final: closing thereof and to retain the same closed, said temperature respon sive element being movable from a cold-start position through a cool-ofi point where it permits said magnet and armature means to close the other of said normally open switches to a heat-up point where it opens said normally closed switch, a stop for said normally closed switch at said cool off point, said temperature responsive element as it cools down after said heater is de-energized by closure of said first normally open switch permitting said normally closed switch to engage said stop and thereby permitting said second normally open switch to be opened at said cool-off point by continued movement of said temperature responsive element to permit energization of said current responsive element, and an operative connection between said first element movable for operating the control and said magnet and armature means to render the means inoperative for retaining said first normally open switch closed when said first element is released by operation being initiallyin circuit with said main switch,

a temperature responsive element affected by the heat from said heater, a current responsive element shunted by said normally closed switch, said element releasing said latch when the element responds to current, one Of said normally open switches shunting said heater to tie-energize it when the switch closes, magnet and armature means to effect the final closing thereof and to retain the same closed, said temperature responsive element being movable from a cold-start position to a cool-off point where it permits said magnet and armature means to close the other of said normally open switches to a heat-up point where it opens said'normally closed switch, a stop for said normally closed switch at said cool-off point, said temperature responsive element as it cools down after said heater is ole-energized by closure of said first normally open switch, permitting said normally closed switch to engage said stop and thereby permitting said second normally open switch to be opened at said cool-off point by continued movement of said temperature responsive element to permit energization of said current responsive element, an operative connection between said first element movable for operating'the control and said magnet and armature means to render the means inoperative for retaining said first normally open switch closed when said first element is released by operation of said current responsive element, and means for adjusting both the cool-off point and the heatup point ofsaid' temperature responsive element individually. V

, 7. In a, thermal control for a toaster having a heating element and a bread carrier movable to a l position for operating the toaster, a main switchclosed by said bread carrier for energizing saidheating element, a latch for said bread carrier and-said main switch, said thermal controlcomprising a normally closed switch and two normally, open switches, a heater and said normally closed switch being initially incircuit with said heating element, a thermal element affected by-theheat from said heater, a thermal latch re- 12 leasing element shunted by said normally closed switch and connected between said heating element and said main switch, one of said normally open switches shunting said'heater to deenergize it when the switch closes, magnet and armature means to effect the final'closing thereof and to retain the same closed, said thermal element being movable from a cold-start position through a, cool-off point where it permits said magnet and armature means to close the other of said normally open switches to a heatup point where it opens said normally closed switch, a stop for said normally closed switch at said cool-off point, said thermal element as it cools down after said heater is de-energized by closure of said first normally .open switch permitting said normally closed switch to engage said stop and thereby permitting said second normallyiopen switch to be opened at said cool-off point by continued movement of said temperature responsive element to permit energization of said thermal element, and adjusting means rotatable for adjusting the toast color by changing the position of the heat-up point, said adjusting means being adapted to be pushed inwardly. to release the bread carrier independent of said latch, means to return said adjusting means to its normal position, said adjusting being adapted to be pulled outwardly for holding said bread carrier against rising above the position where it just opens the main switch thereby to keep the toast warm.

ALFRED J. HUCK.

CHARLES D. V'ISOS.

REFERENCES. CITED The following references are of record in the file of this patent: V

UNITED STATES PATENTS Number Name Date 1,746,827 Fry et al Feb. 11, 1930 2,165,204 Anderson July 11, 1939 2,196,380 Biebel Apr. 9, 1940 2,197,221 Koci Apr. 16, 1940 2,236,402 Gomersall Mar. 25, 1941 2,250,989 Eskin July 29, 1941 2,266,045- Ireland Dec. 16, 1941 2,315,327 Gomersall Mar. 30, 1943 2,320,347 Brosseau et a1 June 1, 1943 2,325,551 Scharf July 27, 1943 2,363,169 Fischer Nov. 21, 1944 2,367,044 Newell ,V an. 9, 1945 Newell Jan. 14, 1947 

